Mitsubishi Electric WD-57831, Service Manual, Page: 38 / 91

MODEL: WD-57831 / WD-65831 / WD-73831
Page 38
Electrical Adjustments
Purpose:
Measuring
Test Point
Measuring
Input Signal
Ext. Trigger
Input Termi-
Symptom:
[Format Circuit]
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Internal Test Patern.
Video
To center the picture on the screen.
Picture is off center.
1. Press “MENU-2-4-5-7”, activates the Service Mode..
2. Select the “FORMAT” function (AUDIO button).
3. Press “REWIND”, activates the Overscan Test Pattern
4. Select “Item 1” HPOS (VIDEO button).
5. Use the ADJUST buttons to center the picture horizontally.
6. Press ENTER to save the new setting.
7. Select “Item 2” VPOS (VIDEO button).
8. Use the ADJUST buttons to center the picture vertically.
9. Press ENTER to save the new setting.
10. Press MENU to exit the Service Mode.
Horizont/Vertical Position
Adjustment
73” Vertical Keystone Adjustment
1) Loosen locking screws (D) through (J).
2) Adjust (A) for minimum vertical keystone
distortion.
73”Horizontal Keystone Adjustment
1) Loosen locking screws (D) through (J).
2) Adjust (B) for minimum horizontal keystone
distortion.
NOTE: If the picture position shifts during mechanical adjustments perform the following positioning
adjustments.
After adjustment...
Tighten the locking screw in the following order D-E-F-G-H-I-J.